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Thread: Thunder T-1 Twin amp speaker impedence

  1. #1

    Thunder T-1 Twin amp speaker impedence

    Hi all. I have a Thunder T-1 twin amp that is missing its speakers. Any idea what impedence the original speakers were? Secondary impedence of the output transformer? Thanks for the help!

  2. #2
    Senior Member
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    I owned one years ago but the speakers were shot. I ended up modifying the amp by replacing the 2-10's with a single vintage 15. My memory says I installed a 8 Ohm 15 inch speaker so the 10's would have been 4 Ohm in series or 16 in parallel.
    I'm sure that doesn't help much as it is based on memory.
    I will check around to see if I have a record of the mod. It would be in an old ebay write-up.
    M

  3. #3
    Senior Member
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    I found a picture on ebay and the speaker shows the speakers wired in parallel.

    I sent the seller, The Blackrider, a message asking for speaker info. Years ago I bought a few Bigsbys from him si maybe he will help.

    M

  4. #4
    Yea, I already asked that guy and hes acting like its a National secret.

    I did find a site that says the OT secondary was 8 ohms for the 12 speaker and 4 ohms for the 2x10. Dont know why someone would make something like that up.

  5. #5
    Senior Member
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    Come to think of it... I think their is a schematic floating around out there that shows both speaker options.
    M

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